# is it possible to gain from charging cold battery

Is it possible to get higher load of energy into a battery if you charge it when its cold eg. +9C? the battery is emptier, but does it let the power in? Is it safe?

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All the above are general comments, and various different kinds of batteries will have restrictions based on how they're made. I'd guess you're talking about car batteries, i.e. lead-acid, batteries, and these are pretty tolerant of temperature within reason. I believe you need to use a lower charge rate below $0^\circ$C though I confess I'm not sure exactly why. To answer your specific question: charging your car battery at $9^\circ$C is fine and will be quicker than at say $20^\circ$C but the final charge of the battery won't be any different.